ABSTRACT

Performance based design is ‘a performance driven approach to offshore engineering design’. It is distinct from risk-based or consequence-based design, in that it does not try to optimize the likelihood of failure on the basis off an understanding the consequence of failure. The objective of performance-based design is to facilitate the design of fixed offshore structures that have predictable performance in compliance with performance goals selected for the intended life. Emphasis is provided on the consideration of entire platform life cycle; from appraisal and selection to disposal, potentially after one or more change-of-use or re-purposing.

The paper discusses the implementation of performance-based design for fixed offshore structures. The role of technology is provided and the importance of understanding and managing technology-associated risk is emphasized and the need for appropriate technology assurance is identified. Descriptions of the historical development to present day platform design practice and alternative technologies are discussed in the following areas: design and analysis, tubular joints, structural framing, frame behavior, fatigue strength, seismicity, and foundation design. The paper also provides information relating to in-service performance of offshore platforms and the consideration of important, non-operational, performance criteria including design for in service inspections and re-purposing of platforms.

If applied competently, with the appropriate technical assurance, a performance-based approach to design provides the opportunity to optimize facilities to better deliver the lifecycle performance goals most closely aligned with the Operators' financial targets and HSE expectations.

INTRODUCTION

Performance based design is ‘a performance driven approach to offshore engineering design’. It is distinct from risk-based or consequence-based design, introduced in the 21st Edition of API RP2A (2000), in that it does not try to optimize the likelihood of failure, based on an understanding the consequence of failure. Instead, the objective of performance-based design is to facilitate the design of structures that have predictable performance in compliance with performance goals selected for the intended life. Effective performance-based design requires communication between the owner and the engineer at the appropriate stage to allow the owner to understand the implications of the performance goals on the design and to allow the risks to be weighed against the rewards.

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